Feed interrupting mechanism for stapling machines



Jan. 30, 1951 o. E. LARssoN FEED INTERRUPTING MECHANISM FOR STAPLING MACHINES Filed NOV. l, 1949 5 Sheets-Sheet l NN @N H mm @N *www Jan. 30, 1951 o. E. LARssoN FEED INTERRUPTING MECHANISM FOR STAPLING MACHINES 3 Sheets-Sheet 2 nventor NN ww .QN s .N @www Filed NOV. l, 1949 Jan. 30, 1951 o. E. LARssoN 2,539,542

FEED INTERRUPTING MECHANISM FOR STAPLING MACHINESV Filed Nov. l, 1949 3 Sheets-Sheet 5 0% nventor E KW7; JMA/4442 Cttorneg Patented Jan. 30, 1951 FEED INTERRUPTING MECHANISM FOR STAFLING MACHINES Olof Einar Larsson, Orebro, Sweden Application November 1, 1949, Serial No. 124,909

In Sweden November 9, 1948 This invention relates to a device for effecting feed interruptions synchronous with the staple driving movements in carton stapling machines in which a feed belt for the carton blank is moved at a constant velocity.

In carton stapling machines in which the carton blanks are fed continuously, difficulties arise in the application of the staples, said difficulties consisting in twitches in the carton material each time a staple is driven into the blank. The object of the present invention is to provide means for eliminating this inconvenience.

I attain this object by mechanism illustrated in the accompanying drawing, in which- Fig. l is a side elevation of a unit of the feed interrupting mechanism as viewed in the direction of the arrows I-I, Fig. 5; Fig. 2 is a plan View of the unit illustrated in Fig. l; Fig. 3 is a side elevation as viewed in the direction of the arrows III-III, Fig. 5; Fig. 4 is a sectional View taken along the line IV-IV, Fig. 2; and Fig. 5 is a plan view of the whole stapling machine.

Referring to the accompanying drawings, each half of the feed interrupting mechanism consists of a complete unit comprising a frame or support I mounted on two bars 2 which are secured to the frame structure 38 of the machine. Since the two units of the mechanism are constructed in a similar manner, only one of them will be described hereinbelow. Carton blanks 33 are moved through the machine with their edges guided by rollers 32. A feed belt diagrammatically indicated at 3 moves continuously and at a constant speed and runs over two pulleys 4 provided at the ends of the frame I. The pulleys 4 are secured to shafts 5 which are mounted in the frame and have axial grooves B for keys. One of the pulley shafts 5 is driven from the motor 34, by means of the belt and pulley connection 35, and a change speed mechanism 31. Between the pulleys, the upper part of the feed belt is supported by three rollers 1 mounted on arms 8 which are secured to shafts I mounted in the frame I. The shafts IB have mounted thereon arm 9 the outer ends of which are connected to a common link I I. To one end of said link, there is secured a helical spring Ila which, as viewed in Fig. l, tends to pull the link towards the right. To the link I I there is attached a depending arm I2 having a roller I3. Against said roller there abuts a cam disc I4 mounted on a shaft I5 which, by means of a chain or belt Ib, is connected with the shaft I5a of the stitching apparatus 3B in a manner such that it is driven at the same number of revolutions as the shaft I5a. As a result there- 3 Claims.

2 of, the rollers 1 will slightly lift and lower the feed belt 3 during each revolution of the shaft Ilia. of the stitching apparatus. Shaft I5a is driven by the electric motor 32 by means of a belt 35. Three idler rollers I5 rest on the carton blank which during the feed movement is engaged bey tween the rollers I5 and the upper surface of the upper part of the belt 3, said rollers being located in opposite relation to the rollers 1. In a similar manner as the rollers 1, the rollers I5 are mounted on one arm I1 of a pair of arms I1, I8 which are secured to a shaft I9 mounted on the frame I. The free ends of the arms I8 are connected to a common link 20 to which a spring 2| is .secured which keeps the rollers I5 in engagement with the carton blank passing below the rollers. Laterally of the rollers 1 and 6-, there are provided two braking strips 22 and 23. The strip 22 is rigidly secured to the frame I in a position such that the upper surface of the strip is located slightly above the position which the belt 3 takes during the application of staples. The strip 23 is by means of two arms 24 and pivots 25 connected to arms 23 which are secured to shafts 21 rotatably mounted on the frame I. To the shafts 21 there are rigidly secured arms l28 which are interconnected by a link 29 so as to move concurrently with each other. A spring 29a tends to pull the link 29 to the right as viewed in Figs. l and 2. The link 29 is limited in its movement to the right by a lug 30 on the link II which engages a roller 3| carried by the link 29. The movement of the link II to the right is limited by the cam I4.

The mode of operation of the device described is as follows.

When the carton blank supplied has reached and acted upon an initiating switch (not shown) the stitching apparatus 35 starts and rotates the cam disc I4. When the cam disc has come into the position shown in Fig. l, the link i I has been moved, under the action of the spring Ila, towards the right and has turned the arms 8 and 9 in a clockwise direction. As a result. the rollers 1 and the blank-carrying portion of the feed belt 3 are lowered so that the carton blank falls down upon the strip 22 so as to rest thereon during a short period of time. At the same time, the link 29, previously kept in its left position by the lug 30, has moved towards the right under the action of the spring 23a and has turned the arms 28 and 25 in an anti-clockwise direction. As a result thereof, the strip 23 is lowered towards the strip 22 and temporarily stops the carton blank which now rests on the strip 22 and not on the feed belt, but which otherwise passes forward between the strips. Upon continued rotation of the cam disc I4, the link l I will be moved towards the left and, at the same time, also the link 29 will be moved in the same directionby means of the lug 30 on the link Il. As a result thereof, the strip 23 will be lifted and disengaged from the carton blank, While the rollers 'l lift the feed belt against the carton blank and the rollers i6 so that the carton blank will be fed forward again.

What I claim is:

1. In a carton blank stapling machine wherein a drive shaft operates a stitching apparatus .to insert staples in a blank travelling by said stitching apparatus on a travelling conveyor, the combination comprising means for supporting the blank-carrying portion of said conveyor .at .a given level as the same travels past said kstitching apparatus, idler rollers bearing on said conveyor and adapted to press against ablank carriedby Said conveyor, means for interrupting Ithe ltravel of a blank on said conveyor, said travelinterrupting means including a pair of brak- ;ing members for engaging opposite surfaces of said blank to arrest its travel with `respect to ythe conveyor, one of said braking members being `movable towards vthe other Vto clamp the blank between said braking members, means for flisplacing said supporting means from supporting .relation to `said conveyor, and means for operating said displacing means and said movable braking member synchronouslyT with the operation of said 'stitching apparatus temporarily to Vinterrupt the travel of the blank during a stapling movement o f said stitching apparatus.

2. In a carton 'blank stapling machine rwherein -a drive shaft operates a stitching apparatus to insert staples in a blank which .is fed past said `stitching apparatus on a travelling conveyor Vin- ,cluding .a pai-r of endless belts, the ACambi.nation with each of said belts .of a movable roller .displaceably mounted .forr movement from and to a blank-carrying -portion of the belt, means for holding said .roller in belt-supporting position, an idler roller Divo-lily :mounted above said portion .of .said beltresilientfmeans for pressing Said idler .roller ,onto a blank V.carried by said belt, a fixed brakingmember located to one v-side .of vsaid belt and below the level of travel of said portion of said belt as determined by the belt-supporting position of said movable roller, a second braking member arranged for cooperation with said iixed braking member to engage a blank, means supporting said second braking member for movement towards and away from said iiXed braking member, and means controlled by said drive shaft for actuating said roller-holding means to displace said movable roller from belt-supporting position and for moving said second braking member towards said fixed braking member to Aseize `and temporarily interrupt the feed of the blank during a stapling movement of said stitching apparatus.

3. In a carton blank stapling machine wherein a Voli-ive shaft operates a stitching apparatus to insert staples in a blank which is fed past said stitching apparatus on a travelling conveyor including a pair of belts, Vthe combination with each of said belts .of :means for interrupting the advance of -a blank lfed Aby said conveyor, said means including a pair Eof gripping members located to one side of the belt with `one of said gripping members being mounted in a fixed position below the normal .carrying `level .of the blank-carrying Vportion of .said belt, a pair .of rotatable shafts supporting the second of said gripping `members for movement towards said xed gripping meniber to seize .a blank therebetween, a plurality of rollers located below the normal carrying level of said portion of said belt, means mounting said :rollers for movement between a position for supporting said lportion of said lbelt above .said fixed gripping member and a lower position in which said portion of said `belt is unsupported by said rollers, means connected to said last-.named mea-ns -for positioning said rollers in belt-snpporting position, land means controlled by said dri-ve shaft lfor periodically actuating said pair of rotatable shafts and said rollers to move said rollers to .their said lower position and to actuate said pair of rotatable shafts to move .said movable -gripping member into .engagement with va blank as the belt yis relieved .from the support of said rollers.

OLOF 'EINAR LARSSON.

.No.references cited. 

